Counter-sheave device for traction cable transportation systems

ABSTRACT

A counter-sheave device for traction cable transportation systems running on guide sheaves is described.  
     In accordance with the present invention the device comprises a spring loaded support ( 2 ) and a sheave ( 4 ) arranged in a plane in which is located at least one near guide sheave on the side opposite the cable in relation to the near guide sheave and sprung means ( 5 ) acting between the support ( 2 ) and the sheave ( 4 ) in the direction of loading of the sheave on the cable.

DESCRIPTION

[0001] The present invention relates to a counter-sheave device for traction cable transportation systems in accordance with the classifying part of claim 1.

[0002] In transportation systems with vehicles pulled by a continuously moving cable the cable is subject to vibration and chatter especially near transmission guide sheaves in curves, especially concave, or even upon starting of the system. Thus there is not only the danger of tripping in the pulling of vehicles but even of fleeting from the guide sheaves. Thus the vehicles could be subject to locking due to bumping of the vehicles on the rails. Even without fleeting the vibrations give rise to jerking movements of the vehicles which are rather unpleasant for the passengers, especially when braking.

[0003] The general purpose of the present invention is to prevent as much as possible vibrations and chatter of the traction cable and propose a counter-sheave device which would allow safe guidance of the cable in the sheaves and especially in concave curves.

[0004] This purpose is achieved by a counter-sheave device for traction cable transportation systems with the characterizing characteristics of claim 1.

[0005] By arranging the described device near a traction cable transportation system guide sheave the cable is always conducted within the sheave. Naturally the device in accordance with the present invention will always be provided near a guide sheave from which the cable is subject to jumping, for example in a curve or in an inclined position of the sheave.

[0006] Other characteristics and details are set forth in the following description of a preferred embodiment shown in the FIGS. of the annexed drawing wherein-

[0007]FIG. 1 shows the counter-sheave device in an elevation view in a direction perpendicular to the extension of a transportation system traction cable,

[0008]FIG. 2 shows a cross section along plane of cut II-II of FIG. 1, and

[0009]FIG. 3 shows a cross section along plane of cut III-III of FIG. 1.

[0010] In FIGS. 1 to 3 the reference number designates as a whole a device in accordance with the present invention.

[0011] The counter-sheave device 1 in accordance with the present invention comprises a bracket 2, a rocker arm 3, a sheave 4, and a compression spring 5.

[0012] The bracket 2 displays a base plate 6 which rests on a fixed beam 7 and is fastened thereto by bolts 8 traversing the beam 7 and tightened on the opposite side of the beam 7 by means of nuts 9 with interposed counter-plates 10. The bracket 2 also consists of two parallel flanges 11 which support the arm 3 in a turning manner between them by means of a support pin 12 and extend beyond the plate 6 downward in ridges 13 to the inclined edges of which is welded a pierced plate 14.

[0013] The spring 5 is arranged between a cup 15 and a cup 16 on which it rests with its ends.

[0014] On the side opposite the side supporting the spring 5 the cup 15 is welded to two parallel tabs 17 born by respective pins 18 in turn born by pairs of lug bolts 19 welded to plates 20 appropriately fastened to the pierced plate 14.

[0015] The cup 15 is traversed, with interposition of a flanged journal box 21, by a shaft 22 directed with a threaded end 23 towards the hole in the plate 14 and having screwed on it a nut with a locknut 24 tightened on a washer 25 designed to form a stop striker on the flanged journal box 21. The cup 16 is screwed to a second threaded end portion of the shaft 22 and is fastened in a fixed position by a nut with locknut 26. The shaft 22 is screwed with its second threaded portion in a blind threaded hole 27 of an eyelet 28 turning on a spherical bearing 29 born by a pin 30 articulated in an intermediate position with the arm 3.

[0016] The arm 3 is made up of two spaced parallel walls 31. The walls 31 bear in a turning manner the pin 30 and at a distance therefrom a pin 32 on the side opposite the spring 5 in relation to the pin 30. The pin 32 houses a ball bearing 33 held in position by rings 34.

[0017] The sheave 3 displays appropriately a groove 36 covered with an antivibration material 37. 

1. Transportation system traction cable counter-sheave device running on guide sheaves characterized in that it comprises a spring loaded support (2) and a sheave (4) arranged in a plane in which is located at least one near guide sheave and, on the side opposite the cable in relation to the near guide sheave, sprung means (5) acting between the bracket (2) and the sheave (4) in the direction of loading of the sheave on the cable.
 2. Device in accordance with claim 1 characterized in that the support comprises a bracket (2) integral with a fixed structure (7) and a rocker arm (3) of which one end is articulated with the bracket (2) and the other end bears in a freely rotating manner the sheave (4) with the sprung means being arranged between the bracket and an intermediate position between the rotation centers of the arm and the sheave. 